In this brief communication we present the first result on what have we learned from a long, virtually
continuously recorded wave height data set. The data was recorded by Petrobras on a mobile platform located on the
northeast Brazilian coast. We found the well-known Rayleigh relation, Hmax/Hs = [ln (N)/2]½, fits the data real well for
Hmax/Hs up to about 2.2, but diverges distinctly when Hmax/Hs values grow larger. An empirical relation for larger Hmax/Hs
can be empirically represented by Hmax/Hs = [ln(N2)/2]¼ .